Precision Time Protocol (PTP) is a high-precision synchronization protocol used in measurement and control systems. The protocol is defined in IEEE1588 (2002 for PTPv1 and 2008 for PTPv2). This test suite can be used to verify robustness of PTP slave implementations.
Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems
IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems
Precision time protocol telecom profile for frequency synchronization